str1 = "Hello"
str2 = " World!"
str3 = ", Python"
str7 = "My name is Tom, age is 24, classmate is 24 grade"
str4 = str1.join(str2)
print(str4)

str5 = str3.split(",")
print(str5)

str6 = str7.split(",")
print(str6)